title: Clinical evaluation of the Bio-Pen for axial length measurement.
abstract: The axial length of 207 eyes was evaluated in a clinical comparison between the Bio-Pen biometric ruler and the Kretz 7200 MA A-scan unit. The overall correlation was 0.99. The Bio-Pen measurement averaged 0.056 mm shorter than the Kretz. The difference was statistically significant (P less than .0001). The Bio-Pen was found to be a convenient and clinically accurate biometer.
authors.affiliation: Department of Ophthalmology, University of Southern California, Los Angeles.
authors.forename: H J
authors.initials: HJ
authors.lastname: Shammas
authors.forename: M
authors.initials: M
authors.lastname: Swearingen
mesh_terms: D001699:Biometry / Q000295:instrumentation*; D002386:Cataract / Q000473:pathology; D005069:Evaluation Studies as Topic; D005123:Eye / Q000473:pathology*; D006801:Humans; D011446:Prospective Studies; D011897:Random Allocation